The US handed control of the canal back to Panama in 1999

The Panama Canal boosted the US as a world power in trade, engineering, and finance

The effort proved the US could achieve grand engineering projects while granting it influence over (and benefitting economically from) a major interoceanic channel and its host country, Panama.

The US finished what the French had started with Panama's canal

For about two decades, Suez Canal-builder and Frenchman Ferdinand de Lesseps led the project, but financial troubles forced it into the hands of the US, who completed it in 1914. This timeline, made to accompany the definitive PBS American Experience documentary about the canal, highlights major moments in its construction.

The century of the Panama Canal

The Panama Canal connects the Atlantic and Pacific Oceans through a 51-mile route that transformed global shipping when it opened in 1914. This breakdown covers how it was built, the workers behind its construction, and why its future may be challenged by climate and competition.

The canal project required the forced removal of local inhabitants

The canal displaced Panamanian communities, with towns like Gatun and Gorgona dismantled and farmlands lost, reshaping the region forever.

Watch the Panama Canal's lock system lift a ship 85 feet above sea level to cross between two oceans.

Drought conditions force fewer ships to sail the Panama Canal daily

In 2023, canal authorities reduced traffic in the canal amid severely dry conditions. These seven infographics from the Woodwell Climate Research Center explain exactly what happened that historically dry October, and how it affected global supply chains.

The Panama Canal was the first to use a lock-and-lake system on a massive scale.

Working conditions on the Panama Canal, built between 1904 and 1914, were abysmal, with thousands of workers dying on the job.

Before the Panama Canal, there was the Panama railroad

The first ship to cross the isthmus of Panama went not by sea but by land: The paddlewheel steamship Explorer was taken apart and transported by rail, an effort that generated “more trouble than profit,” according to one account.

Container ships are just a fraction of total traffic via the canal

While more container ships traverse the canal than any other type of ship, vessels carrying dry bulk goods, vehicle carriers, chemical tankers, passenger ships, and more also pass through the Central American passageway.

How the US took half of Mexico

In just two years, the United States redrew the map of North America. Sparked by border disputes in Texas and fueled by President James Polk’s drive for expansion, the Mexican–American War (1846–1848) reshaped both nations.

Dr. William Gorgas eradicated yellow fever in Panama, crucial to canal construction

The disease was one of the factors hampering the French effort to build the canal. Gorgas' experience elsewhere in the Caribbean had taught him that good drainage and quaranting patients were essential, and he would eventually apply mosquito prevention tactics on a mass scale.

The Monroe Doctrine helped lead to the American occupation of territory abroad

This podcast explores how the policy motivated a century of US military intervention throughout Latin America, the Caribbean, and the Pacific—covering the annexation of Hawaii, the Spanish-American War, and occupations of Cuba, Haiti, and Panama.

The US intervened in Latin America to block communist influence during the Cold War

Fearing Soviet expansion, the US intervened across Latin America by backing coups, funding right-wing regimes, and supporting anti-communist militias—most notably in Cuba, Chile, Nicaragua and Guatemala.

Pan Am was once the largest international airline in the US—but it shut down in 1991 after a series of financial issues, beginning with increased operating costs and reduced demand driven by the oil crisis in the 1970s.

The British Royal Navy—not the US military—enforced the Monroe Doctrine for most of the 19th century

In the early to mid-1800s, the US lacked the ships and military power to prevent European nations from colonizing the Americas. Britain enforced this to protect its commercial interests by keeping rival European powers out of Latin America.

President Trump invoked the Monroe Doctrine in 2025, announcing a new 'Trump Corollary'

On Dec. 2, 2025, the 202nd anniversary of the doctrine, President Donald Trump issued a proclamation reaffirming US "dominance" in the Western Hemisphere. His administration's national security strategy officially codified the "Trump Corollary," stating that the US would prevent non-hemispheric powers from gaining strategic influence in the Americas.

Explore the fraught relations between the United States and Cuba since 1959

From the Cuban Missile Crisis and decades of economic embargo to President Obama's normalization efforts and President Trump's reversion to "maximum pressure," US-Cuba relations have fluctuated between hostility and fleeting diplomacy since Fidel Castro's 1959 revolution.

The Monroe Doctrine was designed to keep Europe out of the Americas

First articulated in 1823 by President James Monroe, the doctrine declared the Western Hemisphere off limits to European colonization. It has since been invoked to justify US military interventions in Latin America, from Teddy Roosevelt's takeover of Venezuela to George H.W. Bush's arrest of Panama's leader Manuel Noriega.

The Roosevelt Corollary transformed the Monroe Doctrine from a defensive warning into a rationale for US military intervention

In 1904, President Theodore Roosevelt declared that the US had the right to exercise international police power in Latin America. Over the following two decades, the US intervened militarily in the region about a dozen times—often enough that Marines became known locally as "State Department troops."

The War Powers Act of 1973 was passed over Nixon's veto to limit the president's ability to wage war unilaterally

Passed in the aftermath of the Vietnam War, the War Powers Resolution requires the president to notify Congress within 48 hours of deploying forces and to end military operations within 60 days without congressional approval. Nixon vetoed the bill, arguing it was unconstitutional, but Congress overrode his veto.

The US tried to overthrow the communist government in Cuba—and failed

In 1961, the US backed an invasion of Cuba by anti-Castro exiles, aiming to spark an uprising against the communist government. The operation collapsed within days, embarrassing the US and pushing Cuba closer to the Soviet Union.

Mexico’s political chaos weakened its defense against US invasion

Mexico’s post-independence instability—marked by coups, power struggles, and weak central control—left its northern frontier vulnerable. That political fragmentation shaped Mexico’s unpreparedness during the Mexican-American War and helped enable US conquest.

The canal became a highway for American reform movements

Beyond goods, the canal carried ideas. Its corridor hosted Second Great Awakening revivals and became a center for activism—fueling abolitionist networks, women’s suffrage organizing, and other reform movements.

The US Pacific strategy sought control of key islands to close in on Japan

The US adopted a two-pronged "island hopping" campaign across the Central and Southwest Pacific from 1943–44, deliberately targeting strategically crucial but less-defended islands. This allowed forces to bypass heavily fortified Japanese strongholds and build airfields for bombers aimed at Japan, drastically accelerating the path toward Tokyo while conserving manpower and resources.

A secret airlift sent 14,000 Cuban children to the US

As part of the covert Operation Pedro Pan, roughly 14,000 Cuban children were quietly flown to the US in the early 1960s—often with no warning, no luggage, and no certainty they would ever see their parents again.

In 1979, Iranian students seized the US Embassy in Tehran, holding 52 Americans hostage for 444 days

Outraged by the US decision to allow the exiled Shah to enter the United States for medical treatment, student protesters stormed the embassy in November 1979. The crisis paralyzed the Carter presidency and ended with a negotiated release on the day of Ronald Reagan's inauguration.

The US Army Corps of Engineers once stopped water from flowing into Niagara Falls to prevent long-term erosion.

See a timeline of the tumultuous relationship between Cuba and the US since 1959

Only 90 miles separate Cuba from the US, yet Cold War hostility froze relations for decades. This timeline traces six decades of tension, from revolution and missile crisis to renewed hardline US policies reintroduced in 2025

The US dollar became the world's reserve currency, backed by gold, after 44 nations gathered in Bretton Woods, New Hampshire, in 1944 with the intention of rebuilding the global economy.

Explore over a century of US-Canadian relations.

Before World War II, the US was a Pacific power

Decades before Pearl Harbor, the US held major Pacific territories—Hawaii, the Philippines, Guam, American Samoa, and numerous island bases—giving it strategic reach across the western Pacific. This presence increasingly overlapped with Japan’s imperial ambitions in the region, contributing to rising tensions.

The Compromise of 1790 broke a deadlock over debt and the national capital

In 1790, Alexander Hamilton, James Madison, and Thomas Jefferson reached an agreement that allowed Congress to assume the states' war debts and to approve a permanent national capital on the Potomac River.

FDR's Good Neighbor policy reversed the interventionism that had grown from the Monroe Doctrine

Franklin Roosevelt pledged in his 1933 inaugural address to be a "good neighbor" to Latin America and to oppose armed intervention by American forces. His administration withdrew troops from previous occupations and signed a multilateral agreement stating that no state has the right to interfere in another's affairs.

Congress has unsuccessfully voted on war powers resolutions over Trump's military operations in Venezuela and Iran

After Trump ordered unilateral military operations in both Venezuela and Iran without congressional authorization, lawmakers from both parties introduced war powers resolutions to block further action. Each effort failed, with Republican majorities largely supporting the president.

The US embargo on Cuba was designed to cause hardship and eventual regime change

A secret 1960 memo by State Department official Lester Mallory argued that trade restrictions were “the only foreseeable means” to unseat Castro by provoking hunger and desperation. This page compiles declassified US documents detailing that strategy and its aftermath.

The US never formally declared war in Vietnam

Instead of formally declaring war, Congress passed the Gulf of Tonkin Resolution in 1964, granting President Johnson broad authority to use military force. The resolution became the legal basis for escalating US involvement without an official declaration of war.

Roughly 25,000 workers died building the canal

For each mile of canal that was built, 500 workers lost their lives. The threats came from multiple fronts: mudslides, floods, earthquakes and disease-carrying mosquitoes. Workplace accidents became so common that artificial limb manufacturers competed for contracts with the canal builders.

Nixon's 1971 decision to untether the dollar from gold ended the Bretton Woods exchange rate system

The Bretton Woods system initially pegged all major currencies to the US dollar, which could be exchanged for gold at a fixed rate of $35 per ounce. Growing deficits and decreasing gold reserves prompted Nixon to end that guarantee in 1971, marking the end of the fixed exchange rate era.

US–Cuba contentious relations began long before the Cold War

Long before the revolution and missile crisis, US involvement in Cuba stretched back over 150 years—rooted in slavery, sugar, and shifting imperial ambitions. This short video traces how cycles of intervention and neglect shaped the island’s modern history.

Engineers shut off Niagara's American Falls for six months in 1969

In June 1969, the US Army Corps of Engineers diverted the Niagara River to halt flow over the American Falls. The dry riverbed allowed geologists to study erosion and remove dangerous rock buildup.

How China could blockade Taiwan

China has its eyes on Taiwan, and could move to isolate the island in order to force it into concessions. Through military maneuvers, building its navy, and other actions, it feels like China is testing the waters for a future blockade if peaceful attempts to unify the two countries fail. This New York Times interactive article details how it might happen.

The US tried to buy Greenland in 1867 and after World War II

Denmark first took possession of the large, ice-covered island in the northern Atlantic in the 1700s. The local population is a mix of native Inuit, Norwegians (from the medieval era), and Danes, though the population is only 56,000. The US has seen the defensive and economic potential of the island for over 150 years.

William Clark negotiated one-tenth of all ratified treaties between Native Americans and the US.

Nixon argued that the War Powers Resolution unconstitutionally restricted his authority

In his veto message, Nixon argued that the resolution would dangerously curtail the president's ability to respond to international crises and that only a constitutional amendment could properly define the limits of executive war powers. Congress disagreed and overrode the veto.

The US dollar has served as the world's reserve currency for 80 years—but is its dominance coming to an end?

Since the establishment of the Bretton Woods economic system, about 90% of global foreign exchange transactions have involved USD. Although no viable alternative exists yet, the dollar's share of central bank reserves has decreased from 73% to 58% from 2001 to 2024, and President Trump's 2025 tariffs have sped up this trend.

War-making authority is divided between Congress and the president in the Constitution

Article I grants Congress the power to declare war and fund the military, while Article II makes the president commander in chief. However, the Constitution does not clearly delineate where one authority ends and the other begins, creating a tension that has never been fully resolved.

How former President Nixon's visit to China shifted geopolitics

While Richard Nixon may be best remembered for Watergate and the disintegration of his presidency, his visit to China in 1972 stands as a triumph of his administration. Learn about the president's visit to Beijing (then referred to as Peking), his methods and approach, and the subsequent opening of diplomatic ties with China.

American presidents did not travel abroad until Teddy Roosevelt visited the Panama Canal in 1906.

Trade between the US and China has significantly increased in recent decades.